银镜法制备具有表面增强红外活性Ag纳米粒子的探讨

利用银镜法在玻璃基底上沉积金属银制得表面增强红外材料,扫描电镜显示,沉积在基片上的银为球状颗粒,且平均直径在100nm左右,银纳米粒子形成一个个不相连的金属岛。以邻硝基苯胺为探针分子,用衰减全反射法(ATR)考察了邻硝基苯胺在银镜基底上的表面增强红外光谱。结果表明:邻硝基苯胺的最小检出质量约为40ng,增强因子约为70。制备银膜的最佳条件为:A gNO3质量分数为1%,反应温度为60℃,且加入表面活性剂可使银纳米粒子分散均匀。

Preparation of Surface Enhanced IR Active Ag Nanoparticles by Silver Mirror Reaction

The silver nanoparticles on glass plate substrates were prepared by silver mirror reaction.The nanostructure of the silver surface was characterized by scanning electron microscopy(SEM).The results showed that the shape of Ag particles deposited on glass plate was ball with the mean particle size of 100 nm.The silver nanoparticles formed the some unconnected metal islands.The o-nitraniline was as-deposited Ag nanoparticles that exhibited the strong surface enhanced infrared absorption(SEIRA),and effected as evidenced by attenuating total reflection(ATR) spectroscopy with o-nitraniline as the probe.The minimum detection quality of o-nitraniline was 40ng,and the enhancement factor was approximately 70.The optimized conditions for preparation of silver nanoparticles were as follows:mass concentration of 1% for silver nitrate,reaction temperature of 60℃,and the good dispersion of silver nanoparticles by addition of some surfactants.